Senior Developer .NET JP055181

ITproposal; Brussel; Hybride; EUR 103 000 - 129 000; Plein temps

Résumé du poste

ITproposal is seeking a Senior .NET Developer to join a professional team in Brussels. You will design, develop and maintain robust .NET applications in a Microsoft tech stack, providing guidance to peers and collaborating with architects, analysts and other developers in an Agile setting.

The role focuses on building with C#, .NET Core, REST APIs, and EF Core, with a hybrid work arrangement (minimum 2 days on-site) and a daily rate of €560–€700.

Qualifications

• Strong experience with C# and .NET/NET Core
• Experience with ASP.NET Web API, REST and EF Core
• Proficient in designing scalable, secure, maintainable software
• Experience mentoring teammates in an Agile environment

Responsabilités

• Develop and maintain software components using C# and .NET / .NET Core.
• Design scalable, maintainable and secure software solutions.
• Develop ASP.NET Web APIs, REST APIs and MVC applications.
• Work with Entity Framework Core and SQL Server.
• Implement authentication and authorization using JWT, OIDC and claims.
• Conduct code reviews and ensure adherence to best practices.
• Write and maintain unit and integration tests.
• Analyze requirements and translate into technical solutions.
• Identify and resolve technical and performance issues.
• Contribute to application security, performance and maintainability.
• Evaluate new technologies for business value.
• Provide technical mentoring to team members.
• Collaborate with architects, analysts and developers in Agile environment.

Connaissances

C# / .NET

ASP.NET Web API

REST APIs

REST / Swagger / OpenAPI

Entity Framework Core

MVC

SQL Server

Authentication & Authorization – JWT,O

Unit and integration testing

Blazor

Description du poste

About The Job Senior Developer .NET JP055181Senior .NET Developer

Location: Brussels, Belgium

Work Arrangement: Hybrid – minimum 2 days per week on‑site

Contract: Full-time

Duration: September 2026 – December 2026, with potential extension

Daily Rate: €560–€700

About The Role

We are looking for an experienced Senior .NET Developer to join a professional development team working on robust, scalable and secure software solutions within a Microsoft technology environment.

You will play a key role in designing, developing and maintaining .NET applications while providing technical guidance to other developers. You will work closely with architects, functional analysts and other technical stakeholders to translate business requirements into high‑quality technical solutions.

Key Responsibilities

• Develop and maintain software components using C# and .NET / .NET Core.


• Design scalable, maintainable and secure software solutions.


• Develop ASP.NET Web APIs, REST APIs and MVC applications.


• Work with Entity Framework Core and SQL Server.


• Implement authentication and authorization using technologies such as JWT, OIDC and claims.


• Conduct code reviews and ensure adherence to development best practices.


• Write and maintain unit and integration tests.


• Analyse functional requirements and translate them into effective technical solutions.


• Identify and resolve technical and performance issues.


• Contribute to application security, performance and maintainability.


• Evaluate and integrate new technologies where they provide business value.


• Provide technical mentoring and coaching to other team members.


• Collaborate with architects, analysts and developers in an Agile environment.

Required Technical Skills

• Strong experience with C# / .NET and .NET Core


• ASP.NET Web API


• REST APIs


• REST / Swagger / OpenAPI


• Entity Framework Core


• MVC


• SQL Server


• Authentication & Authorization – JWT, OIDC, claims


• Unit and integration testing


• Experience with Blazor is an advantage.

Professional Profile

• Strong analytical and problem‑solving abilities.


• Structured and solution‑oriented approach.


• Able to translate complex requirements into practical technical solutions.


• Strong technical leadership and mentoring skills.


• Excellent communication and collaboration skills.


• Comfortable working in changing technical environments.


• Quality‑focused with a strong focus on maintainability, security and performance.

Languages

• Dutch or French: fluent/native‑level proficiency


• English: very good professional proficiency

Practical Information

Brussels, Belgium

Hybrid working – minimum 2 days per week in the Brussels office

Full‑time contract

Start: September 2026

Daily rate: €560–€700